https://www.wusa9.com/article/news/investigations/fentanyl-wastewater-tracking-virginia-delaware-biobot/65-58698c98-f21b-4ea0-8d9b-e822add1eeca
Wastewater fentanyl tracking can be so precise that it can tell if one neighborhood of around 3,000 people is experiencing a surge in fentanyl use.
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